排污閥

DC7000排污閥 DC7000 blowdown valve

    高溫高壓鍋爐排污閥廣泛用于連續節流控制或者鍋爐水的間斷排放，是專(zhuān)門(mén)針對鍋爐水排放工況的高壓差、高流速、沖刷嚴重等特點(diǎn)特殊設計的產(chǎn)品，分為直通式、角式、串聯(lián)式和Y型4種結構。套筒導向多級降壓結構以及閥座出口文丘里管的設計能夠有效控制出口流速，表面硬化處理能有效延長(cháng)使用壽命。

    高溫高壓鍋爐排污閥標準結構為手動(dòng)控制，也可以根據要求選用 氣動(dòng)和電動(dòng)控制，氣動(dòng)控制配以電磁閥、氣控閥、快速排放閥等附件可實(shí)現快速切斷，切斷時(shí)間為1S、2S、3S、4S等。

標準產(chǎn)品

形式：直通式、角式、串聯(lián)式和Y型

規格：DN20 DN25 DN40 DN50 DN65 DN80

公稱(chēng)壓力：ANSI 150 – ANSI 2500

額定行程：25 40 50 60mm

流體溫度：-20℃-566℃

連接形式：承壓焊SW、對焊BW、法蘭式Flanged

流量特性：線(xiàn)性L(fǎng)INEAR、ON – OFF

執行機構：手動(dòng)、氣動(dòng)、電動(dòng)

漏等級：0泄漏

    High temperature and high pressure boiler blowdown valve is widely used for continuous throttling control or intermittent discharge of boiler water. It is a product specially designed for the characteristics of high pressure difference, high flow rate and severe erosion of boiler water discharge conditions. It is divided into straight-through and angle-type. , Tandem and Y-type 4 structures. The sleeve-oriented multi-stage pressure reducing structure and the design of the valve outlet venturi tube can effectively control the outlet flow rate, and the surface hardening treatment can effectively extend the service life.

    The standard structure of the high-temperature and high-pressure boiler blowdown valve is manual control. Pneumatic and electric control can also be selected according to requirements. Pneumatic control is equipped with accessories such as solenoid valve, air control valve, quick discharge valve, etc. to achieve fast cut-off. The cut-off time is 1S, 2S, 3S. , 4S, etc.

Y型

standard product

Form: straight-through, angle, tandem, and Y

Specification: DN20 DN25 DN40 DN50 DN65 DN80

Nominal pressure: ANSI 150 – ANSI 2500

Rated stroke: 25 40 50 60mm

Fluid temperature: -20 ℃ -566 ℃

Connection form: SW, BW, flanged

Flow characteristics: linear LINEAR, ON-OFF

Executive: manual, pneumatic, electric

Leakage level: 0 leaks

高壓鍋爐排污閥分類(lèi)     Classification of high pressure boiler blowdown valve

連續排污閥

    主要用于鍋爐水的連續排放，目的是為了控制高壓鍋爐水中的溶解化學(xué)物的含量，防止鍋爐水飽和后產(chǎn)生溶解鹽，為了再循環(huán)利用，排出的高壓鍋爐水通常會(huì )排放到閃蒸罐中用于其他低壓蒸汽的利用，連續排出的鍋爐水也可直接用于檢測水中的化學(xué)成分含量。

Continuous blowdown valve

    It is mainly used for the continuous discharge of boiler water. The purpose is to control the content of dissolved chemicals in high-pressure boiler water and prevent the generation of dissolved salts after the boiler water is saturated. For recycling, the discharged high-pressure boiler water is usually discharged into the flash tank. For the use of other low-pressure steam, the continuously discharged boiler water can also be directly used to detect the chemical content of the water.

間斷排污閥

    間斷排污閥分為底部排污閥和吹掃排污閥，底部排污閥通常直接安裝于鍋爐的底部，主要利用鍋爐自身的壓力來(lái)定期排放鍋爐底部的顆粒、污垢等沉積物，防止造成管道的堵塞等；吹掃排污閥主要用于鍋爐管線(xiàn)上堆積固體顆粒等快速吹掃排放以及鍋爐冷凝水的排放等。通常使用Y型結構，流通性好，不易堆積固體顆粒。

Intermittent blowdown valve

    Intermittent blowdown valve is divided into bottom blowdown valve and purge blowdown valve. Bottom blowdown valve is usually installed directly on the bottom of the boiler. It mainly uses the pressure of the boiler to regularly discharge particles, dirt and other deposits on the bottom of the boiler to prevent blockage of pipes ; Purge blowdown valve is mainly used for quick purge and discharge of solid particles accumulated on the boiler pipeline and discharge of boiler condensate. The Y-type structure is usually used, which has good fluidity and is not easy to accumulate solid particles.

高壓鍋爐排污閥優(yōu)點(diǎn)

    在石油石化以及電力鍋爐中水排污與排放的重要性往往被忽視了，而不正確的排放會(huì )造成能源的浪費、熱量損失以及增加額外的化學(xué)處理費用等，另外排出去的鍋爐水與鍋爐內的水具有相同的溫度和壓力，可以再循環(huán)應用于其它鍋爐的工況中。鍋爐排污閥的優(yōu)點(diǎn)如下：

    大大縮小維修與維護的費用

    自動(dòng)控制可以大大縮小人力成本

    可以得到更潔凈和高效的蒸汽

    避免資源浪費，縮小操作成本

    能源損失最小化，每年可以節省至少2%的能量損耗

Advantages of high pressure boiler blowdown valve

    The importance of water drainage and emissions in petroleum and petrochemical and power boilers is often overlooked. Incorrect emissions will cause waste of energy, heat loss, and increase in additional chemical treatment costs. In addition, the discharged boiler water and The water has the same temperature and pressure and can be recycled and used in other boilers. The advantages of boiler blowdown valve are as follows:

    Significantly reduce repair and maintenance costs

    Automatic control can greatly reduce labor costs

    Get cleaner and more efficient steam

    Avoid waste of resources and reduce operating costs

    Minimized energy loss, saving at least 2% of energy loss per year

角式                                            直通

高壓鍋爐排污閥實(shí)例分析

壓力溫度參數

壓力等級在A(yíng)NSI600以下   一般P1=47bar.g     P2=4~5bar.g   T=285℃

壓力等級在A(yíng)NSI1500以下  一般P1=140bar.g    P2=4~5bar.g   T=285℃

工況危害

由于高壓降，產(chǎn)生閃蒸現象，流量會(huì )膨脹（出口流速增加），

流體沖刷十分嚴重。

由于可能產(chǎn)生的高流速震動(dòng)，閥桿容易折斷。

高壓差情況下容易產(chǎn)生氣蝕，造成內件沖刷十分嚴重。

高溫情況下材料容易失效，使用壽命短。

采用傳統截止閥閥內件現場(chǎng)維護不方便。

傳統截止閥閥內件沖刷嚴重，使用壽命短。

閥門(mén)操作需要快速關(guān)閉。

結構特點(diǎn)

    采用角式閥體結構，閥座采用文丘里結構，在出口處增加閥門(mén)的流通截面積，降低流速，增加能量損耗，閥座表面硬化處理，延長(cháng)使用壽命

    閥桿閥芯采用整體型設計，閥芯導向改成套筒導向，能承受更高壓差

    閥芯采用cascade多級降壓式結構，有效避免氣蝕

    285℃以上閥門(mén)材料采用F11/F22或者F91來(lái)有效防止高溫情況下閥門(mén)的材料失效情況

    閥內件采用快拆式可維護性設計，現場(chǎng)維護十分方便。

    閥內件采用套筒導向型結構，套筒硬化處理，閥芯堆焊STL合金，閥座堆焊硬質(zhì)合金，大大延長(cháng)使用壽命。

將手動(dòng)改為自動(dòng)控制，可以快速啟閉。

閥芯采用cascade多級降壓結構